Cosmological constant

Definition

The cosmological constant is a term introduced by Albert Einstein in his field equations of General Relativity. It represents a uniform energy density that fills space homogeneously and is associated with dark energy.

5 Must Know Facts For Your Next Test

1. The cosmological constant was originally introduced by Einstein to allow for a static universe.
2. After the discovery of the universe's expansion, Einstein called the cosmological constant his 'biggest blunder.'
3. It is now understood to be related to dark energy, which causes the accelerated expansion of the universe.
4. The value of the cosmological constant has significant implications for the age and fate of the universe.
5. Observations of distant supernovae and cosmic microwave background radiation provide evidence for a positive cosmological constant.

Review Questions

• Why did Einstein introduce the cosmological constant into his equations?
• How does the cosmological constant relate to dark energy?
• What observational evidence supports the existence of a positive cosmological constant?

Related terms

Dark Energy:

A mysterious form of energy thought to be responsible for the accelerated expansion of the universe

General Relativity:

Einstein’s theory describing gravity as a curvature in spacetime caused by mass and energy

Big Bang Theory:

The prevailing explanation for the origin and early development of the universe, starting from an initial singularity